Reflector



B. BART REFLECTOR v Original Filed se t.2s. 1921 //1[0Zd support] mrzd conduciz'ng ma I INVENTOR J WQQQ 4,22 2 ATTORNEY 80 copper, electrolytically Patented Dec. 27, 1927.

UNITED STAT BLASIUS BART, 01' EAfiI! ORANGE, NEW JERSEY.

REFLECTOR.

Original application filed September 23, 1921 Serial K0. 502,679. Divided and this application filed February 28, 1925.

My invention relates to an improved form of metallic reflector of the type now used in flash-lights, search-lights and similar light reflecting articles, and this application con- 5 stitutes a division of my copending application on method of forming metal reflectors and apparatus therefor, Serial No. 502,679, filed Sept. 23, 1921.

There is a demand in the market at present for a form of reflector which can be manufactured cheaply and therefore with the use of a relatively small amount of material and with a minimum amount of labor.

The manufacturing problem is further comlicated by the requirement that such reector be provided with a threaded socket for receiving the electric light bulb and some manufacturers of search-lights require an attachingflange or similar means for mount- .ing the reflector in positionin the frame or other support. 7 g

It has been suggested in applicants coending application, Serial No. 387 ,974, filed une 10, 1920 and Patent No. 1,503,743 granted August 5, 1924 to form reflectors by spraying a solution of a silver salt onto a polished glass mold and to reinforce the thin film of reflecting metal by means of a backing of strengthening material such as deposited on the film of reflecting material while positioned on the mold. It is a vital requirement of this process that the glass mold be chemically clean and highly polished in order tolfiiroperly 85 receive the layer of reflecting mate ial. This is particularly true when the material is nascently reduced silver.

Accordingly, one of the objects of the present invention is to provide for the formation ratus WlllCll can be utilized with its assem 40 of a reflector by practicing the method outlined with its necessity for a polished mold.

and at the same time form the required socket and attaching flange demanded by the search light manufacturerJ liis phase of the invention is attained by providing a glass mold in which the silver deposit receiving surface is continuous without projections and thus capable of being formed initially and also capable of being polished from time-to time as is required by the practicing of the method outlined. Where the socket is to be formed the mold is provided with an opening extending therethrough an which of course does not interfere w th the Serial No. 12,272.

polishing process. It will be understood that a mold provided with the necessary projections to form'sockets, flanges and the like, would interfere with the polishing operation of the mold. The socket required is reformpd preferably as a stamping from s eet meta mounting the mold in position. With the mold held by means engaging the opening and with the-socket located in position the suggested process of depositing the silver on the polished mold is practiced. Afterwards the mold with its silver deposit surrounding the socket is positioned in an electrolytic tank and in this case it is further suggested that the support of the mold constitute the conductor for carrying current to the mold. A layerof backening material, such as copper is deposited on the sprayed silver layer which copper deposit is continued across the socket, thus constituting a means for securing the socketvpermanently in place in the finished reflector. For the purpose of formis positioned at the opening and inci- 'dentally constitutes part of the means for mg the attaching flange it is suggested that I an outlining rimbe demountably fitted to the previously polished surface of the mold and the electrolytically deposited backing be continued across the rim to form the required outwardly projecting fastening means.

Referring to the apparatus feature of the disclosure, an object of the invention is to provide a simple .form of mold construction v in which the different parts are readily demountable, particularly for the purpose of cleaning and polishing the glass mold which forms a part of the construction, and at the same time to provide a single piece of appalight bulb'mountingsocket and a securing flange. It is also required that the reflectors be formed of a comparatively small amount (1 "of material; that all of the reflectors shall be uniform inappearance and that they be constructed without necessity for any refined dotted line position in the electrolytic tank;

and

Figure 2 is a sectional view taken axially through a finished reflector slightly modified from the form shown in Figure 1 removed from the mold construction.

- In the drawings, there is shown an electrolytic tanklO containing an electrolyte 11 on which tank is positioned a combined mold support and conducting rod 12. It is understood that in electrolytic work the tank is of some material length and the single support 12 has a plurality of mold structures positioned along the length thereof. These structures are designed to be turned down into the electrolyte as shown in dotted lines or to be secured in their upright position shown in Figure 1 during the act of depositing the silver on the molds. However, a usual practice is to mount the support 12 on a work table during the process of assembling the mold and depositing the silver on the same. A collar 14 is fixed to the rod 12 and is provided with a threaded bore 15 into which is inserted one end of a brass plug 16, which projects laterally from the support 12. The plug is provided adjacent its opposite end with a stop shoulder 17 and the portion beyond the shoulder is screw threaded as shown at 18. A semi-spherical hollow glass mold '19 is provided at its apex with an opening 20, of a size to receive the threaded end of the plug. The parts are so proportioned that the mold is disposed in position ,With the part thereof surrounding the opening resting on the stop shoulder 17 and the mold is temporarily secured to the plug 16 by means of a cap or socket 21 screwed onto the portion 18 of the plug. The cap is pro vided with an outstanding flange 22 which bears on the outer convex side 23 of the glass mold to force the same into engagement with the stop shoulder 17. The threaded socket is preformed preferably by stamping from sheet metal and has a size and pitch of thread to accommodate whatever type of electric light bulb socket it is desired to screwinto the completed reflector- The free edge 24 of the glass mold is outlinedvby a rim 25 of non-conducting materialpreferably bakelite. The inner periphery 26 of the rim is curved and shaped to snugly fit the glass mold-and thus provide a closed joint etween the glass mold and the bakelite rim The side 27 of the rim adjacent the metal receiving portion of the mold has a width and is shaped to correspond to the width and shape of the securing flange desired on the completed article.

' The device thus far described may be regarded as a complete reflector with a single lamp screwed into the socket at the apex of the same.

Under some conditions, such for instance, as where itis desired to mount a dim lamp in the reflector an additional socket 29 is secured in place usually between the apex and periphery of the reflector. In order to show a form of cap different from the cap 21, the socket 29 is not threaded and is sim ply an open end tube. For the purpose of disclosing a means for securing either socket on cap in place by a means different from the plug 16 there is disclosed a bolt 30 passed through the mold and secured in place by a nut 31. The bolt is provided with a mushroom head 32 which bears atits central part on the outer end of the tubular lamp socket 29 and has a peripheral shoulder 33 which acts to prevent the copper backing from coming up to the top of the socket during the electrolytic depositing step of the method.

In this form of the lamp mounting it may be considered that the lamp is secured in the socket 29 in any usual manner, for instance, the socket may be the usu'al casing of the lamp bases now in general use. p

' The outer convex face of the glass mold is polished over its entire surface either manually or by means of a machine constructed for this purpose. It is appreciated that the surface of the mold polished is continuous and therefore is susceptible of being cleaned and polished without leaving re-entrance angles or other inaccessible portions. The polished mold isthen positioned with the outer end of the'plug extending through the opening, care being taken at this time that the polished surface is not touched by the hand of the operator, otherwise the silver deposit will not adhere to the touched parts. The threaded'socket is screwed into position bindingthe mold against the stop shoulder and bringing the flange of the socket into bearing engagement with the polished portion of the glass mold surrounding the opening. The bake'litc rim is then disposed in position and forced into snug engagement with the glass mold. v

A mixture of silver salts and a reducing agent therefor is sprayed onto the exposed portion of the polished glass in the manner more particularly defined in the above identified applications. The silver deposit is continued up the threads of the flange on the socket and up to the flange forming the rim.

When the desired thickness of silver der ably the support 12 collar 15, plug 16, are formed of some conducting material such as brass and thus constitute a means for con-- veying current to the parts to be coated as is socket to secure the socket permanently in position relative to the reflecting surface in the completed reflector.

Having thus described my invention, I claim: 1. A concaved reflector provided at its apex with a threaded socket, the inner surface external to the socket defined by a thin layer of reflecting metal, a layer of backing metal defining the outer convex surface, extending continuously across all portions of the reflecting layer to strengthen the same and across the socket to secure the 'same in place.

2. A concaved reflector provided at its apex with a threaded socket constituting a sheet metal stamping, the inner surface external to the socket defined by a thin layer of reflecting metal, a' layer of backing metal defining the outer convex surface, extending continuously across all portions of the refleeting layer to strengthen the same and across the socket to secure the same in place.

3. A concaved reflector including a preformed sheet metal socket, a layer of reflecting metal defining the concaved surface about the socket and a layer of electrolytically deposited copper defining the back side of the reflector, said copper layer constituting a backing for the reflector layer and for the socket. I

4. A concave reflector including a preformed sheet metal socket, a layer of reflecting metal defining the concaved surface about the socket and a la er of electrolyti cally deposited copper efining the back side ofthe reflector, said copper layer constituting a backing for the reflector layer and for the socket and projecting beyond the reflector layer to form a securing flange.

5. A concaved reflector comprising three elements, a brass threaded socket, a silver layer definin the inner concavedface to the outside 0 the socket and a copper backing continuous over the convexed side of the silver layer and over the brass socket.

' 6. A concaved reflector comprising three elements, a brass threaded socket, a silver layer defining the inner concaved face to the outside of the socket and a copper backing continuous over. the convex side of the silver layer and over the brass socket, said copper backing projecting" beyond the silver layer to form an outwardly extending securing flange outlining the free ed e o the reflector and formed integral wit the backing for the silver layer.

\ 7. A metallic I reflector including a' reflecting surface and provided with a lamp socket having the side thereof ad'acent the reflecting surface substantially ush with the metal which forms said surface.

'8. A metallic reflector including a backing layer, a layer of reflecting material, a lamp socket having the end adjacent the reflecting surface positioned in advance of the backing layer and secured in position by said backing layer. 9. A metallic reflector including a layer of reflecting material and a layer of a backing material, said reflector provided with a amp socket secured in lace coevalwith the formation of the backlng layer.

10. A parabolic reflector provided with a layer of reflecting material and a lamp socket positioned entirel in rear of the reflecting surface of said ayer and-exteriorly of the parabolic surface defining said surface and means electrolytically soldering the socket to the reflecting material.

11. A metallic reflector including a re-- fleeting layer and a backing layer and a lurahty of sockets secured to the backing ayer and opening through the reflecting layer.

12. A. metallic reflector semi-spherical in form provided with a of preformed lamp sockets exposed from the reflecting surface of the reflector, one of said sockets being positioned at the a ex of the reflector'oand a backin layer of e ectrolytieally deposited meta? securin lamp sockets rigidly fixed in preset re ative pair ' position.

reflector substantially rovided with a pair 13. A metallic semi-spherical in form of lamp sockets expose from'the reflecting surface of the reflector, one of said sockets being ositioned at the apex of the reflector and a apted to accommodate a main lamp and the other socket being offset from the apex socket and adapted to accommodate a dimmer light and a backing layer for reflecting surface, said backing surface secured to the lamp sockets.

14. A metallic reflector provided with a la er of reflecting material, a preformed tubular member and a lager of metal electrolytically deposited on t e reflecting layer and on said member to secure the same toether while leavin far member expose through the layer of reflecting material Signed at East Orange in the county of Essex and Stateof New Jersey this 2nd day of February, 1925.

,BLASIUS BART.

the

substantially I the bore of the tubu- 

